News

Fossils of ancient predators with three eyes shed light on evolution of insects

Published

2 years ago

July 8, 2022

Research based on a collection of fossils from the Burgess Shale shows a bizarre-looking animal with three eyes that sheds light on the evolution of the brain and head of insects and spiders.

The study, published in the journal Current Biology, looked at 268 specimens collected in the 1980s and 1990s from a site in Yoho National Park in British Columbia and stored at the Royal Ontario Museum in Toronto.

Dozens of those fossils contained the brain and nervous system of the half-billion-year-old Stanleycaris, which was part of an ancient, extinct offshoot of the arthropod evolutionary tree called Radiodonta, distantly related to modern insects and spiders.

“It’s a once-in-a-lifetime kind of discovery,” Joe Moysiuk, lead author of the study and a PhD candidate in ecology and evolutionary biology at the University of Toronto, said in an interview this week.

“We get so much information that we couldn’t get from the ordinary fossil record — things like features of the brain. We can see how many segments the brain of this animal is made up of. We can see the processing centres for visual information extending into the eyes of the animal, giving us all kinds of information about the neuroanatomy of this extinct organism.

“That, in turn, helps us to understand the evolution of the brain and nervous system of the group of modern animals we call the arthropods, so that includes things today like insects and spiders.”

The fossils show the brain was composed of two segments, which he said has deep roots in the arthropod lineage and that its evolution likely preceded the three-segmented brain that characterizes present-day insects.

“We think that third segment was added somewhere along that branch that is the tree of life between the divergency of the velvet worms and the modern arthropods,” explained Moysiuk.

Researchers, he said, were able to trace how the evolution of the brain segments occurred more than 500 million years ago.

“That’s pretty incredible when you think we are looking at these fossils. You think of fossils as being mostly things like shells and bones, not things like brains.”

Moysiuk said the right conditions were needed to preserve the small, compressed fossils of an animal that was about 20 centimetres in size.

“The organisms were preserved in these fast-flowing mudflows, so they were tumbling around and flattened in all kinds of orientations,” said Moysiuk, noting most of the specimens were five centimetres or less.

“So, when we looked at the different fossils that we find from these different orientations of preservation, we are able to piece back together what the whole creature looked like in three dimensions.”

Researchers found that the Stanleycaris, known as a predator in the Cambrian period, had an unexpected large central eye in front of its head in addition to its pair of stalked eyes.

“It emphasizes that these animals were even more bizarre-looking than we thought, but also shows us that the earliest arthropods had already evolved a variety of complex visual systems like many of their modern kin,” Jean-Bernard Caron, Moysiuk’s supervisor and curator of invertebrate paleontology at the Royal Ontario Museum, said in a news release.

“Since most radiodonts are only known from scattered bits and pieces, this discovery is a crucial jump forward in understanding what they looked like and how they lived.”

Moysiuk said the finding also shows the importance of fossil collections.

“There’s a lot of treasures that can be found by trolling through things that have been discovered a long time ago,” he said.

“We have this incredible collection of Burgess Shale fossils at the Royal Ontario Museum.”

This report by The Canadian Press was first published July 8, 2022.

Colette Derworiz, The Canadian Press

News

Allen nets shutout as Devils burn Oilers 3-0

Published

5 hours ago

November 4, 2024

Anne Joseph

EDMONTON – Jake Allen made 31 saves for his second shutout of the season and 26th of his career as the New Jersey Devils closed out their Western Canadian road trip with a 3-0 victory over the Edmonton Oilers on Monday.

Jesper Bratt had a goal and an assist and Stefan Noesen and Timo Meier also scored for the Devils (8-5-2) who have won three of their last four on the heels on a four-game losing skid.

The Oilers (6-6-1) had their modest two-game winning streak snapped.

Calvin Pickard made 13 stops between the pipes for Edmonton.

TAKEAWAYS

Devils: In addition to his goal, Bratt picked up his 12th assist of the young season to give him nine points in his last eight games and now 15 points overall. Nico Hischier remains in the team lead, picking up an assist of his own to give him 16 points for the campaign. He has a point in all but four games this season.

Oilers: Forward Leon Draisaitl was held pointless after recording six points in his previous two games and nine points in his previous four. Draisaitl usually has strong showings against the Devils, coming into the contest with an eight-game point streak against New Jersey and 11 goals in 17 games.

KEY MOMENT

New Jersey took a 2-0 lead on the power play with 3:26 remaining in the second period as Hischier made a nice feed into the slot to Bratt, who wired his third of the season past Pickard.

KEY RETURN?

Oilers star forward and captain Connor McDavid took part in the optional morning skate for the Oilers, leading to hopes that he may be back sooner rather than later. McDavid has been expected to be out for two to three weeks with an ankle injury suffered during the first shift of last Monday’s loss in Columbus.

OILERS DEAL FOR D-MAN

The Oilers have acquired defenceman Ronnie Attard from the Philadelphia Flyers in exchange for defenceman Ben Gleason.

The 6-foot-3 Attard has spent the past three season in the Flyers organization seeing action in 29 career games. The 25-year-old right-shot defender and Western Michigan University grad was originally selected by Philadelphia in the third round of the 2019 NHL Entry Draft. Attard will report to the Oilers’ AHL affiliate in Bakersfield.

UP NEXT

Devils: Host the Montreal Canadiens on Thursday.

Oilers: Host the Vegas Golden Knights on Wednesday.

This report by The Canadian Press was first published Nov. 4, 2024.

Source link

News

Mahomes throws 3 TD passes, unbeaten Chiefs beat Buccaneers 30-24 in OT

Published

5 hours ago

November 4, 2024

Anne Joseph

KANSAS CITY, Mo. (AP) — Patrick Mahomes threw for 291 yards and three touchdowns, and Kareem Hunt pounded into the end zone from two yards out in overtime to give the unbeaten Kansas City Chiefs a 30-24 win over the Tampa Bay Buccaneers on Monday night.

DeAndre Hopkins had two touchdown receptions for the Chiefs (8-0), who drove through the rain for two fourth-quarter scores to take a 24-17 lead with 4:17 left. But then Kansas City watched as Baker Mayfield led the Bucs the other way in the final minute, hitting Ryan Miller in the end zone with 27 seconds to go in regulation time.

Tampa Bay (4-5) elected to kick the extra point and force overtime, rather than go for a two-point conversion and the win. And it cost the Buccaneers when Mayfield called tails and the coin flip was heads. Mahomes and the Chiefs took the ball, he was 5-for-5 passing on their drive in overtime, and Hunt finished his 106-yard rushing day with the deciding TD plunge.

Travis Kelce had 14 catches for 100 yards with girlfriend Taylor Swift watching from a suite, and Hopkins finished with eight catches for 86 yards as the Chiefs ran their winning streak to 14 dating to last season. They became the sixth Super Bowl champion to start 8-0 the following season.

Mayfield finished with 200 yards and two TDs passing for the Bucs, who have lost four of their last five.

It was a memorable first half for two players who had been waiting to play in Arrowhead Stadium.

The Bucs’ Rachaad White grew up about 10 minutes away in a tough part of Kansas City, but his family could never afford a ticket for him to see a game. He wound up on a circuitous path through Division II Nebraska-Kearney and a California junior college to Arizona State, where he eventually became of a third-round pick of Tampa Bay in the 2022 draft.

Two year later, White finally got into Arrowhead — and the end zone. He punctuated his seven-yard scoring run in the second quarter, which gave the Bucs a 7-3 lead, by nearly tossing the football into the second deck.

Then it was Hopkins’ turn in his first home game since arriving in Kansas City from a trade with the Titans.

The three-time All-Pro, who already had caught four passes, reeled in a third-down heave from Mahomes amid triple coverage for a 35-yard gain inside the Tampa Bay five-yard line. Three plays later, Mahomes found him in the back of the end zone, and Hopkins celebrated his first TD with the Chiefs with a dance from “Remember the Titans.”

Tampa Bay tried to seize control with consecutive scoring drives to start the second half. The first ended with a TD pass to Cade Otton, the latest tight end to shred the Chiefs, and Chase McLaughlin’s 47-yard field goal gave the Bucs a 17-10 lead.

The Chiefs answered in the fourth quarter. Mahomes marched them through the rain 70 yards for a tying touchdown pass, which he delivered to Samaje Perine while landing awkwardly and tweaking his left ankle, and then threw a laser to Hopkins on third-and-goal from the Buccaneers’ five-yard line to give Kansas City the lead.

Tampa Bay promptly went three-and-out, but its defence got the ball right back, and this time Mayfield calmly led his team down field. His capped the drive with a touchdown throw to Miller — his first career TD catch — with 27 seconds to go, and Tampa Bay elected to play for overtime.

UP NEXT

Buccaneers: Host the San Francisco 49ers on Sunday.

Chiefs: Host the Denver Broncos on Sunday.

—

AP NFL:

Source link

News

NHL roundup: Kuemper helps visiting Kings shut out Predators 3-0

Published

5 hours ago

November 4, 2024

Anne Joseph

NASHVILLE, Tenn. (AP) — Darcy Kuemper made 16 saves for his first shutout of the season and 32nd overall, helping the Los Angeles Kings beat the Nashville Predators 3-0 on Monday night.

Adrian Kempe had a goal and an assist and Anze Kopitar and Kevin Fiala also scored. The Kings have won two of their last three.

Juuse Saros made 24 saves for the Predators. They are 1-2-1 in their last four.

Kopitar opened the scoring with 6:36 remaining in the opening period. Saros denied the Kings captain’s first shot, but Kopitar collected the rebound below the goal line and banked it off the netminder’s skate.

Fiala, a former Predator, made it 2-0 35 seconds into the third.

The Kings held Nashville to just three third-period shots on goal, the first coming with 3:55 remaining and Saros pulled for an extra attacker.

Elsewhere in the NHL on Monday:

—

DEVILS 3 OILERS 0

EDMONTON, Alta. (AP) — Jake Allen made 31 saves for his second shutout of the season and 26th of his NHL career, helping the New Jersey Devils close their western Canadian road trip with a 3-0 victory over the Edmonton Oilers.

Jesper Bratt had a goal and an assist and Stefan Noesen and Timo Meier also scored. The Devils improved to 8-5-2. They have won three of their last four after a four-game skid.

Calvin Pickard made 13 saves for Edmonton. The Oilers had won two straight.

—

Source link